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[2620:137:e000::1:20]) by mx.google.com with ESMTP id l14-20020a17090a598e00b001fd864bec63si15699384pji.178.2022.10.10.00.57.32; Mon, 10 Oct 2022 00:57:44 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=bombadil.20210309 header.b=XVK4eqva; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232140AbiJJHlu (ORCPT + 99 others); Mon, 10 Oct 2022 03:41:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40560 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232206AbiJJHkj (ORCPT ); Mon, 10 Oct 2022 03:40:39 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 052095FAFD; Mon, 10 Oct 2022 00:36:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=IubIfg5PM0k+nLBu0W9G4H26hA5QLhWrO28e455qTr4=; b=XVK4eqvavav2G7Np2xMONjhKpk vfQ0l0kBlVGZrJzAbl8+PYHrSGiTJhX9CWDgSujbfAhyFrQOILN7CRUI7E4t1RPXdsWxlAIkj0Y47 65+pdp3HehwpfuBeXUnPUTXkVMTxhCs/tF1IFhvn+XMmbst0VNp0UW8sBvxFoj/tKmkL6P1PFm8rt xoq9TY9Fp+5QFHDgLqmT0NRwBw1pr/P1gXeaWecWu1+UPNGJMRx/Q+z5gxvvwPsRGCiY7B0nN8utb bGvzP52MbyO3DcZE3x3Cla08o/XwaT7vgvnEYRXp96NlWaIeaYkPl8+R6tBQgz1d7lxyTAsQ2WXcG 9b++DfdQ==; Received: from hch by bombadil.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1ohn5H-00HNDD-6p; Mon, 10 Oct 2022 07:20:19 +0000 Date: Mon, 10 Oct 2022 00:20:19 -0700 From: Christoph Hellwig To: Khazhy Kumykov Cc: Damien Le Moal , Jens Axboe , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] block: allow specifying default iosched in config Message-ID: References: <20220926220134.2633692-1-khazhy@google.com> <7e3a521e-acf7-c3a8-a29b-c51874862344@opensource.wdc.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE, SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Oct 04, 2022 at 04:15:20PM -0700, Khazhy Kumykov wrote: > The kernel already picks and hardcodes a default scheduler, my > thinking is: why not let folks choose? This was allowed in the old > block layer since 2005. You can choose it using CONFIG_CMDLINE. We can't add a config option for every bloody default as that simply does not scale.